Apr 17, 2010

x - ray and google affiliate


Hand mit Ringen (Hand with Rings): print of Wilhelm Röntgen's first "medical" X-ray, of his wife's hand, taken on December 22, 1895 and presented to Professor Ludwig Zehnder of the Physik Institut, University of Freiburg, on 1 January 1896[1][2]
X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 10 to 0.01 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3 × 1016 Hz to 3 × 1019 Hz) and energies in the range 120 eV to 120 keV. They are shorter in wavelength than UV rays. In many languages, X-radiation is called Röntgen radiation, after Wilhelm Conrad Röntgen, who is generally credited as their discoverer, and who had named them X-rays to signify an unknown type of radiation.[3]:1-2
X-rays from about 0.12 to 12 keV (10 to 0.10 nm wavelength), are classified as "soft" X-rays, and from about 12 to 120 keV (0.10 to 0.010 nm wavelength) as "hard" X-rays, due to their penetrating abilities.
Hard X-rays can penetrate solid objects, and their largest use is to take images of the inside of objects in diagnostic radiography and crystallography. As a result, the term X-ray is metonymically used to refer to a radiographic image produced using this method, in addition to the method itself. By contrast, soft X-rays can hardly be said to penetrate matter at all; for instance, the attenuation length of 600 eV (~ 2 nm) x-rays in water is less than 1 micrometer[4] X-rays are a form of ionizing radiation, and exposure to them can be a health hazard.
The distinction between X-rays and gamma rays has changed in recent decades. Originally, the electromagnetic radiation emitted by X-ray tubes had a longer wavelength than the radiation emitted by radioactive nuclei (gamma rays).[4] So older literature distinguished between X- and gamma radiation on the basis of wavelength, with radiation shorter than some arbitrary wavelength, such as 10−11 m, defined as gamma rays.[5] However, as shorter wavelength continuous spectrum "X-ray" sources such as linear accelerators and longer wavelength "gamma ray" emitters were discovered, the wavelength bands largely overlapped. The two types of radiation are now usually distinguished by their origin: X-rays are emitted by electrons outside the nucleus, while gamma rays are emitted by the nucleus


he measure of X-rays ionizing ability is called the exposure:
  • The coulomb per kilogram (C/kg) is the SI unit of ionizing radiation exposure, and it is the amount of radiation required to create one coulomb of charge of each polarity in one kilogram of matter.
  • The roentgen (R) is an obsolete traditional unit of exposure, which represented the amount of radiation required to create one electrostatic unit of charge of each polarity in one cubic centimeter of dry air. 1.00 roentgen = 2.58×10−4 C/kg
However, the effect of ionizing radiation on matter (especially living tissue) is more closely related to the amount of energy deposited into them rather than the charge generated. This measure of energy absorbed is called the absorbed dose:
  • The gray (Gy), which has units of (Joules/kilogram), is the SI unit of absorbed dose, and it is the amount of radiation required to deposit one joule of energy in one kilogram of any kind of matter.
  • The rad is the (obsolete) corresponding traditional unit, equal to 10 millijoules of energy deposited per kilogram. 100 rad = 1.00 gray.
The equivalent dose is the measure of the biological effect of radiation on human tissue. For X-rays it is equal to the absorbed dose.
  • The sievert (Sv) is the SI unit of equivalent dose, which for X-rays is numerically equal to the gray (Gy).
  • The Roentgen equivalent man (rem) is the traditional unit of equivalent dose. For X-rays it is equal to the rad or 10 millijoules of energy deposited per kilogram. 1.00 Sv = 100 rem.
Medical X-rays are a significant source of manmade radiation exposure, accounting for 58% in the United States in 1987, but since most radiation exposure is natural (82%), X-rays only account for 10% of total American radiation exposure.[9]
Reported dosage due to dental X-rays seems to vary significantly. Depending on the source, a typical dental X-ray of a human results in an exposure of perhaps, 3,[10] 40,[11] 300,[12] or as many as 900[13] mrems (30 to 9,000 μSv).

Medical physics

X-rays are generated by an X-ray tube, a vacuum tube that uses a high voltage to accelerate the electrons released by a hot cathode to a high velocity. The high velocity electrons collide with a metal target, the anode, creating the X-rays.[15] In medical X-ray tubes the target is usually tungsten or a more crack-resistant alloy of rhenium (5%) and tungsten (95%), but sometimes molybdenum for more specialized applications, such as when soft X-rays are needed as in mammography. In crystallography, a copper target is most common, with cobalt often being used when fluorescence from iron content in the sample might otherwise present a problem.
The maximum energy of the produced X-ray photon is limited by the energy of the incident electron, which is equal to the voltage on the tube, so an 80 kV tube cannot create X-rays with an energy greater than 80 keV. When the electrons hit the target, X-rays are created by two different atomic processes:
  1. X-ray fluorescence: If the electron has enough energy it can knock an orbital electron out of the inner electron shell of a metal atom, and as a result electrons from higher energy levels then fill up the vacancy and X-ray photons are emitted. This process produces an emission spectrum of X-ray frequencies, sometimes referred to as the spectral lines. The spectral lines generated depend on the target (anode) element used and thus are called characteristic lines. Usually these are transitions from upper shells into K shell (called K lines), into L shell (called L lines) and so on.
  2. Bremsstrahlung: This is radiation given off by the electrons as they are scattered by the strong electric field near the high-Z (proton number) nuclei. These X-rays have a continuous spectrum. The intensity of the X-rays increases linearly with decreasing frequency, from zero at the energy of the incident electrons, the voltage on the X-ray tube.
So the resulting output of a tube consists of a continuous bremsstrahlung spectrum falling off to zero at the tube voltage, plus several spikes at the characteristic lines. The voltages used in diagnostic X-ray tubes, and thus the highest energies of the X-rays, range from roughly 20 to 150 kV.[16]
In medical diagnostic applications, the low energy (soft) X-rays are unwanted, since they are totally absorbed by the body, increasing the dose. Hence, a thin metal sheet, often of aluminum, called an X-ray filter) is usually placed over the window of the X-ray tube, filtering out the low energy components in the spectrum. This is called hardening the beam.
Both of these X-ray production processes are very inefficient, with a production efficiency of only about one percent, and hence, to produce a usable flux of X-rays, a high percentage of the electric power inputted is released as waste heat. The designers must design the X-ray tube to dissipate this excess heat.
Radiographs obtained using X-rays can be used to identify a wide spectrum of pathologies. Due to their short wavelengths, in medical applications X-rays act more like particles than waves. This is in strong contrast to the application of X-rays in crystallography, X-ray crystallography, where their wave-like nature is more important.
To make an X-ray image of human or animal bones, short X-ray pulses illuminate the body or limb, with radiographic film placed behind it. Any bones that are present absorb most of the X-ray photons by photoelectric processes. This is because bones have a higher electron density than soft tissues. [Note that bones contain a high percentage of calcium (20 electrons per atom), potassium (19 electrons per atom) magnesium (12 electrons per atom), and phosphorus (15 electrons per atom). The X-rays that pass through the flesh leave a latent image in the photographic film. When the film is developed, the parts of the image corresponding to higher X-ray exposure are dark, leaving a white shadow of bones on the film.
To generate an image of the cardiovascular system, including the arteries and veins (angiography) an initial image is taken of the anatomical region of interest. A second image is then taken of the same region after iodinated contrast material has been injected into the blood vessels within this area. These two images are then digitally subtracted, leaving an image of only the iodinated contrast outlining the blood vessels. The radiologist or surgeon then compares the image obtained to normal anatomical images to determine if there is any damage or blockage of the vessel.
A specialized source of X-rays which is becoming widely used in research is synchrotron radiation, which is generated by particle accelerators. Its unique features are X-ray outputs many orders of magnitude greater than those of X-ray tubes, wide X-ray spectra, excellent collimation, and linear polarization.[17]

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Electric Guitar Clinic: Would you like single coils or humbuckers with that?

(Matt Griffith | Posted 2010-04-22)

Electric Guitar Clinic: Would you like single coils or humbuckers with that?In this article we will take a look at some of the differences between Humbucking pickups and Single Coil pickups, both technically and tonally. Many think, “Isn’t a Humbucker just two Single Coils side by side?” The answer is both yes and no as they both yield quite different tonal and technical characteristics. There have been many attempts to harness both sounds in one guitar or pickup, but the general consensus is that a guitar is either a Humbucking guitar or a Single Coil. Like they say, you can’t have your cake and eat it too.

To start out, let’s talk a little about how a pickup works. A guitar pickup is essentially a magnet that creates a magnetic field right above the pickup. The magnet picks up the vibrations of the strings and sends the signal to your amplifier to be amplified. Most pickups in electric guitars are passive which means that they don’t have any kind of pre-amp and it is the amplifiers job to boost the signal. Contrastingly, an active pickup uses weaker magnets than passive pickups but has a pre-amp to boost the signal output to a reasonable level. Active pickups are most common in acoustic guitars but can be found in a few electric guitars as well.

Single Coils were the first pickups. The first single coil guitar pickups came in the late 1920’s. A single coil pickup, as the name implies, is made up of a single coil of wire wrapped in one direction (either clockwise or counter clockwise) around the pole pieces. The pole pieces are the circular metal pieces under each string. One of the problems in early single coil pickups was that they picked up a lot of electromagnetic interference from other electric machinery or radio waves which caused a buzz or hum.

This is why humbuckers were invented. They use two coils which are wrapped in opposing directions to give each coil opposing polarity. This would cancel out the electromagnetic interference and help get rid of the hum, thus creating a “hum-bucking” pickup. Humbuckers did not start showing up in guitars until the mid 1950’s. When it comes to tonal differences, it gets a little harder to explain and really comes down to personal opinions and preferences. Many people think humbuckers are for distortion and overdrive, and single coils are for clean patches. This isn’t necessarily the case because many guitarists use single coils for high gain distortion and others use humbuckers exclusively for clean tone. Humbuckers tend to be hotter pickups because they utilize two coils which does make them easier to distort. However, many jazz box guitars have humbuckers and are almost always used for a clean patch. They produce a thicker and darker clean tone than single coils do. The clean from single coils is a more sparkly high type clean that is often associated with country or “Eric Clapton Style” blues. They also are not as quick to overdrive as humbuckers. When single coils are played through a smooth tube overdrive, you can still hear the clean coming through where it gets lost with a humbucker.

Typical guitars that use humbuckers are the Gibson Les Paul, Gibson SG, most PRS models, most Ibanez guitars, and almost all hollow body Guild’s and Gretch’s. The most common single coil guitars are the Fender Stratocaster and Telecaster.

Over the years, each style of pickup has become more versatile. Some humbuckers have the option of coil splitting or tapping. This is the ability to essentially shut off one of the coils in the pickup which can provide a fairly good representation of a single coil pickup. Single coils have gotten much better about electromagnetic interference and there are several “noiseless” single coil pickups available. However, this does not solve the single coil vs. humbucker conundrum because you only get a solid emulation.

Fender has attempted to solve the problem by creating the “Fat Strat,” which utilizes a humbucking pickup at the bridge and two single coil pickups in the usual Stratocaster location. It does thicken the sound when using the humbucker, but there isn’t the option running two humbuckers together as you can in a Gibson Les Paul or SG for a truly saturated overdrive. The guitar also loses some of the ability to get the really twangy bridge sound you can achieve with the single coil pickup.

Single coils and humbuckers are very different animals, and if you want both sounds, you need two guitars. If you need to choose one guitar, the best way to go about it is to go play several different guitars with different pickups through different amps and choose the one you like best.

Electric Guitar Buying Guide

Electric Guitar Buying Guide

As with any musical instrument purchase, buying an electric guitar can be a challenge with so many different types of guitars, different skill levels of the guitarist, different price points, and different genres of music out there. The key to shopping for guitars is to know who will play it, know your budget, and know what's out there.

Know The Guitarist

Are you shopping for a new electric guitar for yourself, for a child, for a friend? How long has this person been playing? What types of music do you think they will want to play the most? Do they have any preferences already? These are some of the questions you will want to ask yourself before heading out to check out what's available in the musical instrument marketplace.

Know Your Budget

Probably the best way to find a good deal is to know exactly what you can spend before you start looking. Set a budget. It's a lot easier to compare prices and features when you know where the line is drawn in the checkbook. Electric guitars can be found for as little as $100, or as much as $20,000 - or more - so obviously price is a very important factor. There are also certain brands that are focused on different pricing segments. For instance, the Squier brand from Fender is designed to be a lower cost, entry-level electric guitar brand. Many models can be found for right around $200, which is a great place to start if you're shopping for someone who is just starting out. If it's a more accomplished player you're shopping for, you should start looking in the $500 to $1000 range. Fender (who makes Squier), also has guitars in higher price ranges, but there are many other competitors in this pricing segment as well such as Epiphone, Jackson, ESP's LTD line, Yamaha, Schecter and others. Obviously, if you have the money to spend, and the person you are shopping for is quite accomplished, or is a collector, you will want to look in some of the higher priced ranges that are over the $1000 price point. Some brands in this range are Gibson, Paul Reed Smith, Zemaitis, and others.

Some Tips on Buying an Electric Guitar From Our Readers

Get what you really want even if it's a little more expensive. Sure, you're going to have a budget, but how many times have you gone and purchased something only to regret later not spending a few more dollars for something nicer. Don't make that mistake the first time. Get what you want. It's a lot easier to pay something off that you really like, than something you're not totally thrilled with. - Dave L., St. Louis, MO, USA

Do some research on the guitarists from the bands that play the music you really like. Chances are, you'll be able to find a wealth of information on what they play on the web. This can help you identify a few guitars you may not have originally thought of. Also, how cool would it be to play the exact guitar that a famous guitarist used on hit recording? - Nelson P., Birmingham, England, UK

Don't just consider solid bodies. There are also hollow-bodies and semi-hollow-body electric guitars out there. While a hollow body is basically an acoustic with pickups perhaps thinner, a semi-hollow body is thinner yet, has better sustain and can be played at higher volume levels without creating feedback. - Frank M., Portland, OR, USA

Just as in other types of guitars (acoustic,classical), the wood used in construction can make a huge difference in the sound of your electric guitar. Maple, Alder and Poplar are two very popular woods used in the construction of electric guitars. - Jeff C., Erie, PA USA

Pickups are the mechanisms by which the string vibrations are "picked up" and transmitted through the electric guitar cable to the amplifier. As you might imagine, they have a significant impact on the sound. If you are looking for a guitar that can play a nice clean tone, you will want to consider single coil pickups. This might be handy for someone that will be picking a lot of chord progressions, or playing music such as jazz, pop, or country. If you are looking for a guitar that can generate some screaming guitar solos and punchy power chords, such as those found in some hard rock and heavy metal music, you're going to want to look for an electric guitar that includes paired single coil pick-ups or humbuckers as part of the onboard electronics. Humbuckers were originally developed to eliminate the noise that can sometimes be evident with single coil pickups, as the two opposing single coils will cancel out feedback between them, or buck them hum. In the best case scenario, the electric guitar you choose may have both single coils and humbuckers and allow you to switch between or mix the responses from them into the final tone. - Matt S., Charleston, WV, USA

Another important feature to consider for the guitar you select is the neck. Just like every guitarist has different musical genres he or she likes, and different skill levels and abilities, everyone has different hands. Necks come in various shapes and sizes. Thin necks can be very fast and helpful for those who would like to play really fast, but thicker necks might be comfortable for playing chords over longer periods of time. It's important to know what is comfortable to you, or the person you are shopping for, so take some time to figure this out before making your final purchase. - Gary K., Cherry Hill, NJ, USA

While you can find decent electric guitars for just a few hundred dollars, you really get into a sweet spot when you're looking in the $1000 - $2000 range. Anything less than that is likely to be made from cheaper materials and, of course, cheaper labor (imported). Anything more than that is probably going to have some nicer features and trims, but probably won't sound a whole heck of a lot better. We recommend this price range to really get the best value for your money in a guitar. - Bryan A., Charlotte, NC, USA

If you have some tips for purchasing an electric guitar, please email them to us through the contacts page and we will review for posting here!

Here's some more tips recently posted on the Fender website, in an article entitled "Electric Guitar Buying Tips" in TechTalk column:

1. Get a grip. A guitar with well-adjusted action should be easy on your hands and fingers-you shouldn't have to have a vise-like grip just to comfortably hit a C chord. You shouldn't have to be Iron Man to play "Iron Man."

2. Sample and hold. Try out different guitars. Play them. Hold them. Play them standing up and sitting down. Stand in front of a mirror with them. Plug them in and turn them up. Hold it up high like George Harrison. Hold it way down low like Slash. It's different horses for different courses—there are no hard and fast rules, but your hands, eyes and ears will tell you which one is the one.

3. Pack it. If you're a beginner, guitar packs are a cool and very affordable way to go-containing everything you need to start playing: the guitar, small amp, strap, gig bag, tuner, cord, strings, picks. Some have stands and instruction books/DVDs.

4. Get the setup. Guitars are made of wood, and wood changes with temperature and humidity. On the long road from manufacturer to dealer, it's natural for a guitar's original factory-spec setup to change, so don't worry if everything isn't tip-top right off the rack, spec-wise. Electric guitars are highly adjustable machines, and a setup can make an amazing difference.

5. Import-ant note. Most domestic guitar makers also offer models built outside the United States that deliver good quality for great prices. Imports built in Japan, Mexico, China, Korea and elsewhere have improved in recent years and often mean solid value, especially if you'd prefer to wait a little longer to buy a more expensive U.S.-made instrument.

6. The amp. The amp affects the sound too. If you're trying out several guitars in a store, try them out through the same amp. That amp, by the way, should be as close as possible to the one you have or the one you're going to get. Use your amp, if possible.

7. Guitar speak. If you're new to playing and you don't really speak guitar fluently just yet, bring somebody with you who does. If you don't know a truss rod from a humbucker and action from intonation, it certainly couldn't hurt.

8. Cross check pricing. New or used, it's fairly simple to hit websites like eBay and Craig's List to see what the instrument you're after is going for in various degrees of age and condition (while it's great to get a baseline for price, we recommend buying Fender guitars only from an authorized Fender dealer, which guarantees that you're buying a genuine Fender product covered by warranties).

9. Beware of too much advice. There is such a thing as too much advice. If ten different well-meaning confidants are trying to sway you in ten different directions about what to buy or where to buy it, remember that you're the one who'll be making the call, spending the money and playing the guitar. Get what you want. That's our advice.

10. Educate yourself. Related to No. 7 above. If you don't speak guitar yet, start learning. Ask questions of those who already know something, and there are all kinds of cool books and websites that are great educational resources.

Here's a link to the full article for reference: Electric Guitar Buying Tips

Electric guitar

  
Fender's Stratocaster is one of the most recognizable electric guitars ever made.
An electric guitar is a guitar that uses the principle of electromagnetic induction to convert vibrations of its metal strings into electric signals. Since the generated signal is too weak to drive a loudspeaker, it is amplified (see amplification) using an audio amplifier before sending it to a loudspeaker. Since the output of an electric guitar is an electric signal, the signal may easily be altered using electronic circuits to add color to the sound. Often the signal is modified using effects such as reverb and distortion. Arguably, no other musical instrument has had more of an impact on how music has evolved since the beginning of the twentieth century than the electric guitar. Conceived in the early 1930’s, the electric guitar became a necessity as jazz musicians sought to amplify their sound. Since then, it has evolved into a stringed musical instrument capable of a multitude of sounds and styles. It served as a major proponent in the development of rock and roll, as well as countless other genres of music.



Fender

Sketch of Fender lap steel guitar from 1944 patent application.
In 1946, radio repairman and instrument amplifier maker Leo Fender designed the first commercially successful solid-body electric guitar with a single magnetic pickup, which was initially named the Esquire. This was a departure from the typically hollow-bodied Jazz-oriented instruments of the time and immediately found favor with Country-Western artists in California. The two-pickup version of the Esquire was called the "Broadcaster". However, Gretsch had a drumset marketed with a similar name (Broadkaster), so Fender changed the name to Telecaster.
Features of the Telecaster included: an ash body; a maple 25½" scale, 21-fret or 22-fret neck attached to the body with four-bolts reinforced by a steel neckplate; two single-coil, 6-pole pickups (bridge and neck positions) with tone and volume knobs, pickup selector switch; and an output jack mounted on the side of the body. A black bakelite pickguard concealed body routings for pickups and wiring. The bolt-on neck was consistent with Leo Fender's belief that the instrument design should be modular to allow cost-effective and consistent manufacture and assembly, as well as simple repair or replacement. Due to the earlier mentioned trademark issue, some of the first production Telecasters were delivered with headstock decals with the Fender logo but no model identification.
A 2004 maple necked Fender Stratocaster next to a Vox amplifier.
In 1954, Fender introduced the Fender Stratocaster, or "Strat." The Stratocaster was seen as a deluxe model and offered various product improvements and innovations over the Telecaster. These innovations included a well dried ash or alder double-cutaway body design for bridge assembly with an integrated spring vibrato mechanism (called a synchronized tremolo by Fender, thus beginning a confusion of the terms that still continues), three single-coil pickups, and body comfort contours. Leo Fender is also credited with developing the first commercially successful electric bass guitar called the Fender Precision Bass, introduced in 1951.

[edit] Vox

In 1962 Vox introduced the pentagonal Phantom guitar, originally made in England but soon after made by Alter EKO of Italy. It was followed a year later by the teardrop-shaped Mark VI, the prototype of which was used by Brian Jones of The Rolling Stones, and later Johnny Thunders of the New York Dolls. Vox guitars also experimented with onboard effects and electronics. In the mid 1960s, as the sound of electric 12-string guitars became popular, Vox introduced the Phantom XII and Mark XII electric 12-string guitars as well as the Tempest XII which employed a more conventional Fender style body and thus is often overlooked as a Vox classic from the Sixties. The few that were manufactured also came from Italy. Vox also produced other traditional styles of 6- and 12-string electric guitars in both England and Italy, The 12-string electric guitars had a much larger neck and body and averaged at the weight of 26.4 pounds(11.9 kg), they were also played on tables such as a piano or other sit down instrument.

[edit] Construction

Legend: 1. Headstock: 1.1 machine heads; 1.2 truss rod cover; 1.3 string guide; 1.4 nut.
2. Neck: 2.1 fretboard; 2.2 inlay fret markers; 2.3 frets; 2.4 neck joint.
3. Body; 3.1 "neck" pickup; 3.2 "bridge" pickup; 3.3 saddles; 3.4 bridge; 3.5 fine tuners; 3.6 tremolo arm; 3.7 pickup selector switch; 3.8 volume and tone control knobs; 3.9 output connector; 3.10 strap buttons.
4. Strings: 4.1 bass strings 4.2 treble strings.
While guitar construction has many variations, in terms of the materials used for the body, the shape of the body, and the configuration of the neck, bridge, and pickups, there are features which are found in almost every guitar. The photo below shows the different parts of an electric guitar. The headstock (1) contains the metal machine heads, which are used for tuning ; the nut (1.4), a thin fret-like strip of metal, plastic, graphite or bone which the strings pass over as they first go onto the fingerboard; the machine heads (1.1), which are worm gears which the player turns to change the string tension and thus adjust the tuning; the frets (2.3), which are thin metal strips which stop the string at the correct pitch when a string is pressed down against the fingerboard; the truss rod (1.2), a metal cylinder used for adjusting the tension on the neck (not found on all instruments); decorative inlay (2.2), a feature not found on lower-cost instruments.
The neck and the fretboard (2.1) extend from the body; at the neck joint (2.4), the neck is either glued or bolted to the body; the body (3) of this instrument is made of wood which is painted and lacquered, but some guitar bodies are also made of polycarbonate or other materials; pickups (3.1, 3.2), which are usually magnetic pickups, but which may also be piezoelectric transducer pickups; the control knobs (3.8) for the volume and tone potentiometers; a fixed bridge (3.4) -on some guitars, a spring-loaded hinged bridge called a "tremolo system" is used instead, which allows players to "bend" notes or chords down in pitch or perform a vibrato embellishment; and a plastic pickguard, a feature not found on all guitars, which is used to protect the body from scratches or cover the control cavity which holds most of the electric guitar's wiring.
The wood that the body (3) is made of is a very disputed subject considered by some to largely determine the sonic qualities of the guitar, while others believe that the sonic difference in a solid body guitar is very subtle between woods. In acoustic and archtop guitars there is a more pronounced sonic definition caused by the type of wood used. Typical woods include alder (brighter, but well rounded), swamp ash (similar to alder, but with more pronounced highs and lows), mahogany (dark, bassy, warm), poplar (similar to alder) and basswood (very neutral). Maple, a very bright tonewood, is also a popular body wood, but is very heavy. For this reason it is often placed as a 'cap' on a guitar made of primarily of another wood. Cheaper guitars are often made of cheaper woods, such as plywood, pine or agathis, not true hardwoods, which can affect the durability and tone of the guitar.Although most guitars are made from wood, any material may be used in the construction of a guitar. Materials such as plastic or cardboard are examples of unusual but possible materials that affect the overall sound of the guitar.

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The pyramids of Giza are among the most recognizable symbols of the civilization of ancient Egypt.
Map of ancient Egypt, showing major cities and sites of the Dynastic period (c. 3150 BC to 30 BC).
Ancient Egypt was an ancient civilization of eastern North Africa, concentrated along the lower reaches of the Nile River in what is now the modern country of Egypt. The civilization coalesced around 3150 BC[1] with the political unification of Upper and Lower Egypt under the first pharaoh, and it developed over the next three millennia.[2] Its history occurred in a series of stable Kingdoms, separated by periods of relative instability known as Intermediate Periods. Ancient Egypt reached its pinnacle during the New Kingdom, after which it entered a period of slow decline. Egypt was conquered by a succession of foreign powers in this late period, and the rule of the pharaohs officially ended in 31 BC when the early Roman Empire conquered Egypt and made it a province.[3]
The success of ancient Egyptian civilization stemmed partly from its ability to adapt to the conditions of the Nile River Valley. The predictable flooding and controlled irrigation of the fertile valley produced surplus crops, which fueled social development and culture. With resources to spare, the administration sponsored mineral exploitation of the valley and surrounding desert regions, the early development of an independent writing system, the organization of collective construction and agricultural projects, trade with surrounding regions, and a military intended to defeat foreign enemies and assert Egyptian dominance. Motivating and organizing these activities was a bureaucracy of elite scribes, religious leaders, and administrators under the control of a pharaoh who ensured the cooperation and unity of the Egyptian people in the context of an elaborate system of religious beliefs.[4][5]
The many achievements of the ancient Egyptians include the quarrying, surveying and construction techniques that facilitated the building of monumental pyramids, temples, and obelisks; a system of mathematics, a practical and effective system of medicine, irrigation systems and agricultural production techniques, the first known ships,[6] Egyptian faience and glass technology, new forms of literature, and the earliest known peace treaty.[7] Egypt left a lasting legacy. Its art and architecture were widely copied, and its antiquities carried off to far corners of the world. Its monumental ruins have inspired the imaginations of travellers and writers for centuries. A newfound respect for antiquities and excavations in the early modern period led to the scientific investigation of Egyptian civilization and a greater appreciation of its cultural legacy, for Egypt and the world.[8]

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Egypt (pronounced /ˈiːdʒɪpt/ ( listen); Arabic: مصر‎ Miṣr, pronounced [misˤɾ] ( listen); Egyptian Arabic: مصر Maṣr [ˈmɑsˤɾ]; Coptic: Ⲭⲏⲙⲓ, kīmi; Egyptian: Kemet), officially the Arab Republic of Egypt, is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Thereby, Egypt is a transcontinental country, and is considered to be a major power in North Africa, Mediterranean Region, African continent, Nile Basin, Islamic World and the Red Sea. Covering an area of about 1,010,000 square kilometers (390,000 sq mi), Egypt is bordered by the Mediterranean Sea to the north, the Gaza Strip and Israel to the northeast, the Red Sea to the east, Sudan to the south and Libya to the west.

Egypt is one of the most populous countries in Africa and the Middle East. The great majority of its estimated 77.4 million[1] live near the banks of the Nile River, in an area of about 40,000 square kilometers (15,000 sq mi), where the only arable agricultural land is found. The large areas of the Sahara Desert are sparsely inhabited. About half of Egypt's residents live in urban areas, with most spread across the densely populated centres of greater Cairo, Alexandria and other major cities in the Nile Delta.

Egypt is famous for its ancient civilization and some of the world's most famous monuments, including the Giza pyramid complex and its Great Sphinx. The southern city of Luxor contains many ancient artifacts, such as the Karnak Temple and the Valley of the Kings. Egypt is widely regarded as an important political and cultural nation of the Middle East.

Egypt possesses one of the most developed and diversified economies in the Middle East, with sectors such as tourism, agriculture, industry and service at almost equal rates in national production.[citation needed] Consequently, the Egyptian economy is rapidly developing, due in part to legislation aimed at luring investments, coupled with both internal and political stability, along with recent trade and market liberalization

The ancient Egyptian name of the country is Kemet (km.t) [𓆎𓅓𓏏𓊖], which means "black land", referring to the fertile black soils of the Nile flood plains, distinct from the deshret (dšṛt), or "red land" of the desert.[4] The name is realized as kīmi and kīmə in the Coptic stage of the Egyptian language, and appeared in early Greek as Χημία (Khēmía).[5] Another name was t3-mry "land of the riverbank".[6] The names of Upper and Lower Egypt were Ta-Sheme'aw (t3-šmˁw) "sedgeland" and Ta-Mehew (t3 mḥw) "northland", respectively.

Miṣr, the Arabic and modern official name of Egypt (Egyptian Arabic: Maṣr), is of Semitic origin, directly cognate with other Semitic words for Egypt such as the Hebrew מִצְרַיִם (Mitzráyim), literally meaning "the two straits" (a reference to the dynastic separation of upper and lower Egypt).[7] The word originally connoted "metropolis" or "civilization" and means "country", or "frontier-land".

The English name Egypt was borrowed from Middle French Egypte, from Latin Aegyptus, from ancient Greek Aígyptos (Αἴγυπτος), from earlier Linear B a-ku-pi-ti-yo. The adjective aigýpti-, aigýptios was borrowed into Coptic as gyptios, kyptios, and from there into Arabic as qubṭī, back formed into qubṭ, whence English Copt. The Greek forms were borrowed from Late Egyptian (Amarna) Hikuptah "Memphis", a corruption of the earlier Egyptian name Hwt-ka-Ptah (ḥwt-k3-ptḥ), meaning "home of the ka (soul) of Ptah", the name of a temple to the god Ptah at Memphis.[8] Strabo attributed the word to a folk etymology in which Aígyptos (Αἴγυπτος) evolved as a compound from Aigaiou huptiōs (Aἰγαίου ὑπτίως), meaning "below the Aegean".
History
Main articles: History of Egypt, Ancient Egypt, and Egyptians
Pre-historic Egypt
Giza Pyramids
See also: Population history of Egypt

There is evidence of rock carvings along the Nile terraces and in the desert oases. In the 10th millennium BC, a culture of hunter-gatherers and fishers replaced a grain-grinding culture. Climate changes and/or overgrazing around 8000 BC began to desiccate the pastoral lands of Egypt, forming the Sahara. Early tribal peoples migrated to the Nile River where they developed a settled agricultural economy and more centralized society.[9]

By about 6000 BC the Neolithic culture rooted in the Nile Valley.[10] During the Neolithic era, several predynastic cultures developed independently in Upper and Lower Egypt. The Badarian culture and the successor Naqada series are generally regarded as precursors to Dynastic Egyptian civilization. The earliest known Lower Egyptian site, Merimda, predates the Badarian by about seven hundred years. Contemporaneous Lower Egyptian communities coexisted with their southern counterparts for more than two thousand years, remaining somewhat culturally separate, but maintaining frequent contact through trade. The earliest known evidence of Egyptian hieroglyphic inscriptions appeared during the predynastic period on Naqada III pottery vessels, dated to about 3200 BC.[11]
Ancient Egypt
tAwy ('Two Lands')
in hieroglyphs
N16
N16

Unicode: 𓇾𓇾

A unified kingdom was founded circa 3150 BC by King Menes, leading to a series of dynasties that ruled Egypt for the next three millennia. Egyptians later referred to their unified country as tawy [𓇾𓇾], meaning "two lands", and later kemet [𓆎𓅓𓏏𓊖] (Coptic: kīmi), the "black land", a reference to the fertile black soil deposited by the Nile River. Egyptian culture flourished during this long period and remained distinctively Egyptian in its religion, arts, language and customs. The first two ruling dynasties of a unified Egypt set the stage for the Old Kingdom period, c.2700−2200 BC., famous for its many pyramids, most notably the Third Dynasty pyramid of Djoser and the Fourth Dynasty Giza Pyramids.
Djoser Pyramid
The Great Sphinx and the Pyramids of Giza, built during the Old Kingdom, are modern national icons that are at the heart of Egypt's thriving tourism industry.

The First Intermediate Period ushered in a time of political upheaval for about 150 years.[12] Stronger Nile floods and stabilization of government, however, brought back renewed prosperity for the country in the Middle Kingdom c. 2040 BC, reaching a peak during the reign of Pharaoh Amenemhat III. A second period of disunity heralded the arrival of the first foreign ruling dynasty in Egypt, that of the Semitic Hyksos. The Hyksos invaders took over much of Lower Egypt around 1650 BC and founded a new capital at Avaris. They were driven out by an Upper Egyptian force led by Ahmose I, who founded the Eighteenth Dynasty and relocated the capital from Memphis to Thebes.
The Hanging Church of Cairo, first built in the third or fourth century AD, is one of the most famous Coptic Churches in Egypt.

The New Kingdom (c.1550−1070 BC) began with the Eighteenth Dynasty, marking the rise of Egypt as an international power that expanded during its greatest extension to an empire as far south as Tombos in Nubia, and included parts of the Levant in the east. This period is noted for some of the most well-known Pharaohs, including Hatshepsut, Thutmose III, Akhenaten and his wife Nefertiti, Tutankhamun and Ramesses II. The first historically attested expression of monotheism came during this period as Atenism. Frequent contacts with other nations brought new ideas to the New Kingdom. The country was later invaded and conquered by Libyans, Nubians and Assyrians, but native Egyptians eventually drove them out and regained control of their country.[13]
Persian, Greek and Roman occupation

The Thirtieth Dynasty was the last native ruling dynasty during the Pharaonic epoch. It fell to the Persians in 343 BC after the last native Pharaoh, King Nectanebo II, was defeated in battle. Later, Egypt fell to the Greco–Macedonians and Romans, beginning over two thousand years of foreign rule. The last ruler from the Ptolemaic line was Cleopatra VII, who committed suicide with her lover Marc Antony, after Caesar Augustus had captured them.

Before Egypt became part of the Byzantine realm, Christianity had been brought by Saint Mark the Evangelist in the AD first century. Diocletian's reign marked the transition from the Roman to the Byzantine era in Egypt, when a great number of Egyptian Christians were persecuted. The New Testament had by then been translated into Egyptian. After the Council of Chalcedon in AD 451, a distinct Egyptian Coptic Church was firmly established.[14]
Arab and Ottoman occupation

The Byzantines were able to regain control of the country after a brief Persian invasion early in the seventh century, until in AD 639, Egypt was absorbed into the Islamic Empire by the Muslim Arabs. When they defeated the Byzantine Armies in Egypt, with the help of some revolutionary Egyptians, the Arabs brought Sunni Islam to the country. Early in this period, Egyptians began to blend their new faith with indigenous beliefs and practices that had survived through Coptic Christianity that was expanded in Egypt by the Byzantines, leading to various Sufi orders that have flourished to this day.[15] Muslim rulers nominated by the Islamic Caliphate remained in control of Egypt for the next six centuries, with Cairo as the seat of the Caliphate under the Fatimids. With the end of the Kurdish Ayyubid dynasty, the Mamluks, a Turco-Circassian military caste, took control about AD 1250. By late 13th century, Egypt linked the Red Sea, India, Malaya, and East Indies.[16] The strategic positioning "assured importance in productive economy".[16] They continued to govern the country until the conquest of Egypt by the Ottoman Turks in 1517, after which it became a province of the Ottoman Empire. The mid-14th-Century Black Death killed about 40% of the country's population.[17] After the 15th century, the threat of military European Crusaders and Central Asian Mongols set the Egpytian system into decline.[16] The defensive militarization challenged the civil society and economic institutions.[16] The weakening of the economic system combined with the effects of Black Death left Egypt vulnerable to foreign invasion which can be seen with the Portuguese taking over their trade.[18] Egypt suffered six famines between 1687 and 1731.[19] The famine that afflicted Egypt in 1784 cost it roughly one-sixth of its population.[20]
Battle of the Pyramids, July 21, 1798, by François-Louis-Joseph Watteau.
Modern history
British admiral Codrington negotiating with Muhammad Ali Pasha in the latter's palace in Alexandria.

The brief French invasion of Egypt led by Napoleon Bonaparte began in 1798. The expulsion of the French in 1801 by Ottoman, Mamluk, and British forces was followed by four years of anarchy in which Ottomans, Mamluks, and Albanians who were nominally in the service of the Ottomans, wrestled for power. Out of this chaos, the commander of the Albanian regiment, Muhammad Ali (Kavalali Mehmed Ali Pasha) emerged as a dominant figure and in 1805 was acknowledged by the Sultan in Istanbul as his viceroy in Egypt; the title implied subordination to the Sultan but this was in fact a polite fiction: Ottoman power in Egypt was finished and Muhammad Ali, an ambitious and able leader, established a dynasty that was to rule Egypt (at first really and later as British puppets) until the revolution of 1952.[21]

His primary focus was military: he annexed Northern Sudan (1820–1824), Syria (1833), and parts of Arabia and Anatolia; but in 1841 the European powers, fearful lest he topple the Ottoman Empire itself, checked him: he had to return most of his conquests to the Ottomans, but he kept the Sudan and his title to Egypt was made hereditary. A more lasting result of his military ambition is that it made him the moderniser of Egypt. Eager to learn the military (and therefore industrial) techniques of the great powers he sent students to the West and invited training missions to Egypt. He built industries, a system of canals for irrigation and transport, and reformed the civil service.[21]

For better or worse, the introduction in 1820 of long-staple cotton, the Egyptian variety of which became famous, transformed Egyptian agriculture into a cash-crop monoculture before the end of the century. The social effects of this were enormous: it led to the concentration of agriculture in the hands of large landowners, and, with the additional trigger of high cotton prices caused by the United States' civil war production drop, to a large influx of foreigners who began in earnest the exploitation of Egypt for international commodity production.[21]
Mosque of Muhammad Ali
Female nationalists demonstrating in Cairo, 1919.

Muhammad Ali was succeeded briefly by his son Ibrahim (in September 1848), then by a grandson Abbas I (in November 1848), then by Said (in 1854), and Isma'il (in 1863). Abbas I was cautious. Said and Ismail were ambitious developers; unfortunately they spent beyond their means. The Suez Canal, built in partnership with the French, was completed in 1869. The cost of this and other projects had two effects: it led to enormous debt to European banks, and caused popular discontent because of the onerous taxation it required. In 1875 Ismail was forced to sell Egypt's share in the canal to the British Government. Within three years this led to the imposition of British and French controllers who sat in the Egyptian cabinet, and, "with the financial power of the bondholders behind them, were the real power in the Government."[22]

Local dissatisfaction with Ismail and with European intrusion led to the formation of the first nationalist groupings in 1879, with Ahmad Urabi a prominent figure. In 1882 he became head of a nationalist-dominated ministry committed to democratic reforms including parliamentary control of the budget. Fearing a diminishment of their control, Britain and France intervened militarily, bombarding Alexandria and crushing the Egyptian army at the battle of Tel el-Kebir.[23] They reinstalled Ismail's son Tewfik as figurehead of a de facto British protectorate.[24]

In 1914 the Protectorate was made official, and the title of the head of state, which had changed from pasha to khedive in 1867, was changed to sultan, to repudiate the vestigial suzerainty of the Ottoman sultan, who was backing the Central powers in World War I. Abbas II was deposed as khedive and replaced by his uncle, Hussein Kamel, as sultan.[25]

In 1906, the Dinshaway Incident prompted many neutral Egyptians to join the nationalist movement. After the First World War, Saad Zaghlul and the Wafd Party led the Egyptian nationalist movement, gaining a majority at the local Legislative Assembly. When the British exiled Zaghlul and his associates to Malta on 8 March 1919, the country arose in its first modern revolution. Constant revolting by the Egyptian people throughout the country led Great Britain to issue a unilateral declaration of Egypt's independence on 22 February 1922.[26]
British infantry manning a sandbagged defensive position near El Alamein, July 1942.

The new Egyptian Government drafted and implemented a new constitution in 1923 based on a parliamentary representative system. Saad Zaghlul was popularly elected as Prime Minister of Egypt in 1924. In 1936 the Anglo-Egyptian Treaty was concluded. Continued instability in the Government due to remaining British control and increasing political involvement by the king led to the ousting of the monarchy and the dissolution of the parliament in a military coup d'état known as the 1952 Revolution. The officers, known as the Free Officers Movement, forced King Farouk to abdicate in support of his son Fuad.

On 18 June 1953, the Egyptian Republic was declared, with General Muhammad Naguib as the first President of the Republic. Naguib was forced to resign in 1954 by Gamal Abdel Nasser – the real architect of the 1952 movement – and was later put under house arrest. Nasser assumed power as President in June 1956. British forces completed their withdrawal from the occupied Suez Canal Zone on 13 June 1956. His nationalization of the Suez Canal on 26 July 1956 prompted the 1956 Suez Crisis.
View of Cairo, the largest city in Africa and the Middle East. The Cairo Opera House (bottom-right) is the main performing arts venue in the Egyptian capital.

Three years after the 1967 Six Day War, during which Israel had invaded and occupied Sinai, Nasser died and was succeeded by Anwar Sadat. Sadat switched Egypt's Cold War allegiance from the Soviet Union to the United States, expelling Soviet advisors in 1972. He launched the Infitah economic reform policy, while violently clamping down on religious and secular opposition alike.

In 1973, Egypt, along with Syria, launched the October War, a surprise attack against the Israeli forces occupying the Sinai Peninsula and the Golan Heights. It was an attempt to liberate part of the Sinai territory Israel had captured 6 years earlier. Sadat hoped to seize some territory through military force, and then regain the rest of the peninsula by diplomacy. The conflict sparked an international crisis between the two world superpowers: the US and the USSR, both of whom intervened. Two UN-mandated ceasefires were needed to bring military operations to a halt. While the war ended with a military Israeli victory, it presented Sadat with a political victory that later allowed him to regain the Sinai in return for peace with Israel.[27]

Sadat made a historic visit to Israel in 1977, which led to the 1979 peace treaty in exchange for the complete Israeli withdrawal from Sinai. Sadat's initiative sparked enormous controversy in the Arab world and led to Egypt's expulsion from the Arab League, but it was supported by most Egyptians.[28] A fundamentalist military soldier assassinated Sadat in Cairo in 1981. He was succeeded by the incumbent Hosni Mubarak. In 2003, the Egyptian Movement for Change, popularly known as Kefaya, was launched to seek a return to democracy and greater civil liberties.
Identity
Main article: Egyptian Identity
Mahmoud Mokhtar's Egypt's Renaissance 1919–1928, Cairo University.

The Nile Valley was home to one of the oldest cultures in the world, spanning three thousand years of continuous history. When Egypt fell under a series of foreign occupations after 343 BC, each left an indelible mark on the country's cultural landscape. Egyptian identity evolved in the span of this long period of occupation to accommodate, in principle, two new religions, Islam and Christianity; and a new language, Arabic, and its spoken descendant, Egyptian Arabic.[29]

The degree to which Egyptians identify with each layer of Egypt's history in articulating a sense of collective identity can vary. Questions of identity came to fore in the last century as Egypt sought to free itself from foreign occupation for the first time in two thousand years. Three chief ideologies came to head: ethno-territorial Egyptian nationalism, secular Arab nationalism and pan-Arabism, and Islamism. Egyptian nationalism predates its Arab counterpart by many decades, having roots in the nineteenth century and becoming the dominant mode of expression of Egyptian anti-colonial activists and intellectuals until the early 20th century.[30] Arab nationalism reached a peak under Nasser but was again relegated under Sadat; meanwhile, the ideology espoused by Islamists such as the Muslim Brotherhood is present in small segments of the lower-middle strata of Egyptian society.[31]

The work of early nineteenth-century scholar Rifa'a et-Tahtawi led to the Egyptian Renaissance, marking the transition from Medieval to Early Modern Egypt. His work renewed interest in Egyptian antiquity and exposed Egyptian society to Enlightenment principles. Tahtawi co-founded with education reformer Ali Mubarak a native Egyptology school that looked for inspiration to medieval Egyptian scholars, such as Suyuti and Maqrizi, who themselves studied the history, language and antiquities of Egypt.[32]

Egypt's renaissance peaked in the late 19th and early 20th centuries through the work of people like Muhammad Abduh, Ahmed Lutfi el-Sayed, Muhammad Loutfi Goumah, Tawfiq el-Hakim, Louis Awad, Qasim Amin, Salama Moussa, Taha Hussein and Mahmoud Mokhtar. They forged a liberal path for Egypt expressed as a commitment to personal freedom, secularism and faith in science to bring progress.[33]
Governance

Egypt has been a republic since 18 June 1953. President Mohamed Hosni Mubarak has been the President of the Republic since 14 October 1981, after the assassination of President Mohammed Anwar El-Sadat. Mubarak is currently serving his fifth term in office (28 years). He is the leader of the ruling National Democratic Party. Prime Minister Dr. Ahmed Nazif was sworn in as Prime Minister on 9 July 2004, following the resignation of Dr. Atef Ebeid from his office.

Although power is ostensibly organized under a multi-party semi-presidential system, whereby the executive power is theoretically divided between the President and the Prime Minister, in practice it rests almost solely with the President who traditionally has been elected in single-candidate elections for more than fifty years. Egypt also holds regular multi-party parliamentary elections. The last presidential election, in which Mubarak won a fifth consecutive term, was held in September 2005.

In late February 2005, President Mubarak announced in a surprise television broadcast that he had ordered the reform of the country's presidential election law, paving the way for multi-candidate polls in the upcoming presidential election. For the first time since the 1952 movement, the Egyptian people had an apparent chance to elect a leader from a list of various candidates. The President said his initiative came "out of my full conviction of the need to consolidate efforts for more freedom and democracy."[34] However, the new law placed draconian restrictions on the filing for presidential candidacies, designed to prevent well-known candidates such as Ayman Nour from standing against Mubarak, and paved the road for his easy re-election victory.[35]
Mohammad Hosni Mubarak

Concerns were again expressed after the 2005 presidential elections about Government interference in the election process through fraud and vote-rigging, along with police brutality and violence by pro-Mubarak supporters against opposition demonstrators.[36] After the election, Egypt imprisoned Nour, and the U.S. Government stated the "conviction of Mr. Nour, the runner-up in Egypt's 2005 presidential elections, calls into question Egypt's commitment to democracy, freedom, and the rule of law."[37]

As a result, most Egyptians are skeptical about the process of democratization and the role of the elections. Less than 25 percent of the country's 32 million registered voters (out of a population of more than 72 million) turned out for the 2005 elections.[38] A proposed change to the constitution would limit the president to two seven-year terms in office.[39]

Thirty-four constitutional changes voted on by parliament on 19 March 2007 prohibit parties from using religion as a basis for political activity; allow the drafting of a new anti-terrorism law to replace the emergency legislation in place since 1981, giving police wide powers of arrest and surveillance; give the president power to dissolve parliament; and end judicial monitoring of election.[40] As opposition members of parliament withdrew from voting on the proposed changes, it was expected that the referendum would be boycotted by a great number of Egyptians in protest of what has been considered a breach of democratic practices.

Eventually it was reported that only 27% of the registered voters went to the polling stations under heavy police presence and tight political control of the ruling National Democratic Party. It was officially announced on 27 March 2007 that 75.9% of those who participated in the referendum approved of the constitutional amendments introduced by President Mubarak and was endorsed by opposition free parliament, thus allowing the introduction of laws that curb the activity of certain opposition elements, particularly Islamists.

The CIA World Factbook states that the legal system is based on Islamic and civil law (particularly Napoleonic codes); and that the judicial review takes place by a Supreme Court, which accepts compulsory ICJ jurisdiction only with reservations.
Foreign relations
Main article: Foreign relations of Egypt
Mubarak in the G8 Summit in Italy 2009

Egypt's foreign policy operates along moderate lines. Factors such as population size, historical events, military strength, diplomatic expertise and a strategic geographical position give Egypt extensive political influence in Africa and the Middle East. Cairo has been a crossroads of regional commerce and culture for centuries, and its intellectual and Islamic institutions are at the center of the region's social and cultural development.

The permanent Headquarters of the Arab League are located in Cairo and the Secretary General of the Arab League has traditionally been an Egyptian. Former Egyptian Foreign Minister Amr Moussa is the current Secretary General. The Arab League briefly moved from Egypt to Tunis in 1978, as a protest to the signing by Egypt of a peace treaty with Israel, but returned in 1989.

Egypt was the first Arab state to establish diplomatic relations with Israel, with the signing of the Egypt-Israel Peace Treaty in 1979. Despite the peace treaty, Israel is still largely considered an enemy country within Egypt. [41] Egypt has a major influence among other Arab states, and has historically played an important role as a mediator in resolving disputes between various Arab states, and in the Israeli-Palestinian dispute. Egypt is a Major non-NATO ally of the United States.

Former Egyptian Deputy Prime Minister Boutros Boutros-Ghali served as Secretary-General of the United Nations from 1991 to 1996.

In the twenty-first century, Egypt has had a major problem with immigration, as millions of Africans attempt to enter Egypt fleeing poverty and war. Border control methods can be "harsh, sometimes lethal."[42]

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Opera is an art form in which singers and musicians perform a dramatic work combining text (called a libretto) and musical score.[1] Opera is part of the Western classical music tradition.[2] Opera incorporates many of the elements of spoken theatre, such as acting, scenery and costumes and sometimes includes dance. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble.

Opera started in Italy at the end of the 16th century (with Jacopo Peri's lost Dafne, produced in Florence around 1597) and soon spread through the rest of Europe: Schütz in Germany, Lully in France, and Purcell in England all helped to establish their national traditions in the 17th century. However, in the 18th century, Italian opera continued to dominate most of Europe, except France, attracting foreign composers such as Handel. Opera seria was the most prestigious form of Italian opera, until Gluck reacted against its artificiality with his "reform" operas in the 1760s. Today the most renowned figure of late 18th century opera is Mozart, who began with opera seria but is most famous for his Italian comic operas, especially The Marriage of Figaro, Don Giovanni, and Così fan tutte, as well as The Magic Flute, a landmark in the German tradition.

The first third of the 19th century saw the highpoint of the bel canto style, with Rossini, Donizetti and Bellini all creating works that are still performed today. It also saw the advent of Grand Opera typified by the works of Meyerbeer. The mid to late 19th century was a "golden age" of opera, led and dominated by Wagner in Germany and Verdi in Italy. The popularity of opera continued through the verismo era in Italy and contemporary French opera through to Puccini and Strauss in the early 20th century. During the 19th century, parallel operatic traditions emerged in central and eastern Europe, particularly in Russia and Bohemia. The 20th century saw many experiments with modern styles, such as atonality and serialism (Schoenberg and Berg), Neoclassicism (Stravinsky), and Minimalism (Philip Glass and John Adams). With the rise of recording technology, singers such as Enrico Caruso became known to audiences beyond the circle of opera fans. Operas were also performed on (and written for) radio and television.

God in islam

Allah (God) in Islam

The most fundamental belief that a Muslim has is that "There is only One God," the Creator, the Sustainer -- known in the Arabic language and by Muslims as Allah. Allah is not a foreign god, nor an idol. Arabic-speaking Christians use the same word for the Almighty.

The fundamental pillar of faith in Islam is to declare that "there is no deity worthy of worship except the One True Almighty God" (in Arabic: "La ilaha ill Allah").

God's Nature
In the Qur'an, we read that Allah is Compassionate and Merciful. He is Kind, Loving, and Wise. He is the Creator, the Sustainer, the Healer. He is the One who Guides, the One who Protects, the One who Forgives. There are traditionally ninety-nine names, or attributes, that Muslims use to describe Allah's nature.

A "Moon God"?
Some non-Muslims mistakenly think that Allah is an "Arab god," a "moon god," or some sort of idol. Allah is the proper name of the One True God, in the Arabic language used by Muslims all over the world. Allah is a name that is neither feminine nor masculine, and it cannot be made plural (unlike god, gods, goddess, etc). Muslims believe that there is nothing in the heavens nor on earth that deserves worship except Allah, the One True Creator.

Tawhid - The Unity of God
Islam is based on the concept of Tawhid, or Unity of God. Muslims are strictly monotheistic, and fiercely reject any attempt to make God visible or human. Islam rejects any form of idol worship, even if its intention is to get "closer" to God, and rejects the Trinity or any attempt to make God human.

Quotes From the Qur'an

"Say, 'He is Allah, the One;
Allah, the Eternal, Absolute;
He begets not, and neither is He begotten;
And there is nothing that can be compared to Him."
Qur'an 112:1-4

In Muslim understanding, God is beyond our sight and understanding, yet at the same time "nearer to us than our jugular vein" (Qur'an 50:16). Muslims pray directly to God, with no intermediary, and seek guidance from Him alone, because "...Allah knows well the secrets of your hearts" (Qur'an 5:7).

"When My servants ask thee concerning Me,
I am indeed close (to them).
I respond to the prayer of every suppliant
when he calls on Me.
Let them also, with a will,
Listen to My call, and believe in Me,
that they may walk in the right way."
Qur'an 2:186

In the Qur'an, people are asked to look around them for the signs of Allah in the natural world. The balance of the world, the rhythms of life, are "signs for those who would believe." The universe is in perfect order: the orbits of the planets, the cycles of life and death, the seasons of the year, the mountains and the rivers, the mysteries of the human body. This order and balance are not haphazard nor random. The world, and everything in it, has been created with a perfect plan, by the One who knows all.

Islam is a natural faith, a religion of responsibility, purpose, balance, discipline, and simplicity. To be a Muslim is to live your life remembering God and striving to follow His merciful guidance.

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Alcohol
Brief
Description:
Ethyl alcohol, or ethanol, is an intoxicating ingredient found in beer, wine, and liquor. Alcohol is produced by the fermentation of yeast, sugars, and starches. It is a central nervous system depressant that is rapidly absorbed from the stomach and small intestine into the bloodstream. A standard drink equals 0.6 ounces of pure ethanol, or 12 ounces of beer; 8 ounces of malt liquor; 5 ounces of wine; or 1.5 ounces (a "shot") of 80-proof distilled spirits or liquor (e.g., gin, rum, vodka, or whiskey). NIDA does not conduct research on alcohol; for more information, please visit the National Institute on Alcohol Abuse and Alcoholism (NIAAA) and the Centers for Disease Control (CDC).
Effects:
Alcohol affects every organ in the drinker's body and can damage a developing fetus. Intoxication can impair brain function and motor skills; heavy use can increase risk of certain cancers, stroke, and liver disease. Alcoholism or alcohol dependence is a diagnosable disease characterized by a strong craving for alcohol, and/or continued use despite harm or personal injury. Alcohol abuse, which can lead to alcoholism, is a pattern of drinking that results in harm to one's health, interpersonal relationships, or ability to work.
Statistics
and Trends:
In 2008, 51.6% of Americans age 12 and older had used alcohol at least once in the 30 days prior to being surveyed; 23.3% had binged (5+ drinks within 2 hours); and 23.3% drank heavily (5+ drinks on 5+ occasions). In the 12-17 age range, 14.6% had consumed at least one drink in the 30 days prior to being surveyed; 8.8% had binged; and 2.0% drank heavily. Source: National Survey on Drug Use and Health (Substance Abuse and Mental Health Administration Web Site). The NIDA-funded 2008 Monitoring the Future Study showed that 15.9% of 8th graders, 28.8% of 10th graders, and 43.1% of 12th graders had consumed at least one drink in the 30 days prior to being surveyed, and 5.4% of 8th graders, 14.4% of 10th graders, and 27.6% of 12th graders had been drunk. Source: Monitoring the Future (University of Michigan Web Site